you can import the transaction to your wallet with the private key for the transaction....see console help under help debug window..so the address u sent to is the one that has the private key so open it and -dump the private key for that transaction and then import it back into a litecoin wallet...

first of all...you cant send litecoins to a bitcoin address...it wouldn't get confirmed at all and should just show back up in your wallet...bitcoin and litecoin address have different starting figures...I know a lot fo Litecoin address start with L and bitcoin and litecoin address have different number of characters too I think...id have to count to be sure on that one though...anyway...if there are no confirmations and you sent the coins from a Litecoin core wallet then you can just right click the transaction and click cancel transaction...